An independent AC fault-code reference
ACErrorCodes.com exists to answer one question quickly: “what does this blinking light or two-letter code on my air conditioner actually mean?” Most people only see these codes at the worst possible moment — a hot afternoon, a stopped compressor, a technician who won’t arrive until tomorrow — so the goal here is a fast, plain-language lookup rather than a full repair manual.
The directory is organised by AC type — split, window, and commercial/VRF — and within each, by brand. Codes are compiled from common, publicly documented troubleshooting patterns used across the industry for each manufacturer’s product lines, then written in plain language rather than reproduced from any single manual.
This is not a substitute for a manufacturer’s service manual, and it’s not a repair walkthrough for opening sealed refrigerant systems, handling electrical components, or servicing compressors. For anything beyond a basic check (a dirty filter, a loose sensor connector, blocked outdoor airflow), the right move is a licensed HVAC technician.
Error code numbering can change between a manufacturer’s model years and regional product lines. Where a code’s meaning is uncertain, this site says so rather than guessing. If you spot a code listed incorrectly, the contact page has a way to flag it.